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//  Copyright Microsoft Corporation
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//  http://www.apache.org/licenses/LICENSE-2.0
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//  ----------------------------------------------------------------------------------

namespace DurableTask.Core
{
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading.Tasks;

    internal class SynchronousTaskScheduler : TaskScheduler
    {
        public override int MaximumConcurrencyLevel => 1;

        protected override void QueueTask(Task task)
        {
            TryExecuteTask(task);
        }

        protected override bool TryExecuteTaskInline(
            Task task,
            bool taskWasPreviouslyQueued)
        {
            return TryExecuteTask(task);
        }

        protected override IEnumerable<Task> GetScheduledTasks()
        {
            return Enumerable.Empty<Task>();
        }
    }
}